While I take issue with Revir’s use of the word “literal” I think it was mainly intended as a comparison of the roles within the plot, not the nature of the act/actors.
AU Xe’ra is a complete unknown beyond the Mag’har scenario. We only see Lightmother and assume Xe’ra. Could be a different floating chandelier entirely.
Conceptually it’s just a heroic sacrifice story.
Turalyon risks everything to receive an audience with Yrel. He explains that the Lightbound have lost their way. The Lightmother is hanging from the ceiling like a good chandelier and sees Yrel hesitate. Yrel realizes Turalyon is a good person, not corrupted, and a true champion of the Light.
The chandelier spins aggressively and makes a comment about “doing what’s best for the universe” drawing the attention of the human-goat diplomacy mission. Turalyon shields Yrel leaving himself open for the effect which bathes the room in light and leaves Turalyon a mindless husk of Light. While shielded, Yrel uses her newfound knowledge of Azeroth to execute a “bubble hearth” that she mispronounces. Or maybe a portal appears that was intended to save Turalyon and she hops through.
In a later raid, the AU Lightmother tries to have Turalyon perform a similar act on his children (egads adventurers!) but the power of Alleria’s love for him (and 20 adventurers beating on him) breaks the hold the AU Lightmother has on him long enough for us to whisk him away to safety. He reveals he remembers nothing by being unable to understand a word anyone says nor speak Common. It’s a process.
While we hunt the evil AU Lightmother down, we quest to grab Turalyons memories via mini games. “Hey look! I found Turalyon’s memory of one of his kids! Wonder where the other one is. Ooops time-gated.”
Then when we get to the AU Lightmother we beat on her until she is subdued (she’s just misguided after all, the Light will redeem her) but then we find (in a Mythic only secret phase) the Infinite Dragonflight performing a ritual to merge the two universes - and all others. The split timelines have yielded aspects of individual being heightened in one or another. Garrosh had very little evil, but it manifested in one evil Garrosh while all others are the greatest Horde leaders (for some reason though he’s still dead - the universe is a weird place); the Lightmother had very little evil, and it was spread in varying degrees of control issues; Gul’dan is almost always evil but in one universe he is a non-dancing clown made of candy (we learn this from dialogue, but also he’s a new decoration for Hollow’s End where we can pick candy off him and eat it for a random buff); somehow there is no evil Anduin in any universe, because Anduin.
More importantly, Nozdormu has seen what comes next and has changed from Bronze to Infinite! The split universes will be overcome by the Devourers from outside our universe. To help bolster the defenses of the universe against the Devourers coming to eat existence (oh no!) they must combine our strength. Once the ritual completes, the Lightmother becomes benevolent. A force for good. Just in time to watch a giant Devourer appear and eat a bunch of the Infinite Dragonflight. Someone magical whisks us away and we prepare for the fight to not be eaten.
Then comes the new expansion intro screen:
World of Warcraft: Don’t be Eaten.
This story writes itself.